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/*************************************************************************
* Copyright (C) 2010 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Finish combinations.
*/
#include "dimension.h"
#include <math.h>
#include <stdlib.h>
/** Diffuse combination callback. */
static dmnsn_color
dmnsn_finish_combination_diffuse_fn(const dmnsn_finish *finish,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal)
{
dmnsn_finish **params = finish->ptr;
if (params[0]->diffuse_fn && params[1]->diffuse_fn) {
return dmnsn_color_add(
(*params[0]->diffuse_fn)(params[0], light, color, ray, normal),
(*params[1]->diffuse_fn)(params[1], light, color, ray, normal)
);
} else if (params[0]->diffuse_fn) {
return (*params[0]->diffuse_fn)(params[0], light, color, ray, normal);
} else if (params[1]->diffuse_fn) {
return (*params[1]->diffuse_fn)(params[1], light, color, ray, normal);
} else {
return dmnsn_black;
}
}
/** Specular combination callback. */
static dmnsn_color
dmnsn_finish_combination_specular_fn(const dmnsn_finish *finish,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal,
dmnsn_vector viewer)
{
dmnsn_finish **params = finish->ptr;
if (params[0]->specular_fn && params[1]->specular_fn) {
return dmnsn_color_add(
(*params[0]->specular_fn)(params[0], light, color, ray, normal, viewer),
(*params[1]->specular_fn)(params[1], light, color, ray, normal, viewer)
);
} else if (params[0]->specular_fn) {
return (*params[0]->specular_fn)(params[0], light, color, ray,
normal, viewer);
} else if (params[1]->specular_fn) {
return (*params[1]->specular_fn)(params[1], light, color, ray,
normal, viewer);
} else {
return dmnsn_black;
}
}
/** Ambient combination callback. */
static dmnsn_color
dmnsn_finish_combination_ambient_fn(const dmnsn_finish *finish,
dmnsn_color pigment)
{
dmnsn_finish **params = finish->ptr;
if (params[0]->ambient_fn && params[1]->ambient_fn) {
return dmnsn_color_add((*params[0]->ambient_fn)(params[0], pigment),
(*params[1]->ambient_fn)(params[1], pigment));
} else if (params[0]->ambient_fn) {
return (*params[0]->ambient_fn)(params[0], pigment);
} else if (params[1]->ambient_fn) {
return (*params[1]->ambient_fn)(params[1], pigment);
} else {
return dmnsn_black;
}
}
/** Reflection combination callback. */
static dmnsn_color
dmnsn_finish_combination_reflection_fn(const dmnsn_finish *finish,
dmnsn_color reflect, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal)
{
dmnsn_finish **params = finish->ptr;
if (params[0]->reflection_fn && params[1]->reflection_fn) {
return dmnsn_color_add(
(*params[0]->reflection_fn)(params[0], reflect, color, ray, normal),
(*params[1]->reflection_fn)(params[1], reflect, color, ray, normal)
);
} else if (params[0]->reflection_fn) {
return (*params[0]->reflection_fn)(params[0], reflect, color, ray, normal);
} else if (params[1]->reflection_fn) {
return (*params[1]->reflection_fn)(params[1], reflect, color, ray, normal);
} else {
return dmnsn_black;
}
}
/** Finish combination destructor callback. */
static void
dmnsn_finish_combination_free_fn(void *ptr)
{
dmnsn_finish **params = ptr;
dmnsn_delete_finish(params[0]);
dmnsn_delete_finish(params[1]);
dmnsn_free(ptr);
}
dmnsn_finish *
dmnsn_new_finish_combination(dmnsn_finish *f1, dmnsn_finish *f2)
{
dmnsn_finish *finish = dmnsn_new_finish();
dmnsn_finish **params = dmnsn_malloc(2*sizeof(dmnsn_finish *));
params[0] = f1;
params[1] = f2;
finish->ptr = params;
if (f1->diffuse_fn || f2->diffuse_fn)
finish->diffuse_fn = &dmnsn_finish_combination_diffuse_fn;
if (f1->specular_fn || f2->specular_fn)
finish->specular_fn = &dmnsn_finish_combination_specular_fn;
if (f1->ambient_fn || f2->ambient_fn)
finish->ambient_fn = &dmnsn_finish_combination_ambient_fn;
if (f1->reflection_fn || f2->reflection_fn)
finish->reflection_fn = &dmnsn_finish_combination_reflection_fn;
finish->free_fn = &dmnsn_finish_combination_free_fn;
return finish;
}
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